Provided by: freebsd-manpages_10.1~RC1-1_all bug

NAME

     igb — Intel(R) PRO/1000 PCI Express Gigabit Ethernet adapter driver

SYNOPSIS

     To compile this driver into the kernel, place the following line in your kernel
     configuration file:

           device igb

     Alternatively, to load the driver as a module at boot time, place the following line in
     loader.conf(5):

           if_igb_load="YES"

DESCRIPTION

     The igb driver provides support for PCI Express Gigabit Ethernet adapters based on the Intel
     82575 and 82576 Ethernet controller chips.  The driver supports Transmit/Receive checksum
     offload and Jumbo Frames.  Furthermore it supports TCP segmentation offload (TSO) on all
     adapters.  The identification LEDs of the adapters supported by the igb driver can be
     controlled via the led(4) API for localization purposes.

     For questions related to hardware requirements, refer to the documentation supplied with
     your Intel PRO/1000 adapter.  All hardware requirements listed apply to use with FreeBSD.

     Support for Jumbo Frames is provided via the interface MTU setting.  Selecting an MTU larger
     than 1500 bytes with the ifconfig(8) utility configures the adapter to receive and transmit
     Jumbo Frames.  The maximum MTU size for Jumbo Frames is 9216.

     This driver supports hardware assisted VLANs.  The igb driver supports the following media
     types:

     autoselect   Enables auto-negotiation for speed and duplex.

     10baseT/UTP  Sets 10Mbps operation.  Use the mediaopt option to select full-duplex mode.

     100baseTX    Sets 100Mbps operation.  Use the mediaopt option to select full-duplex mode.

     1000baseSX   Sets 1000Mbps operation.  Only full-duplex mode is supported at this speed.

     1000baseTX   Sets 1000Mbps operation.  Only full-duplex mode is supported at this speed.

     The igb driver supports the following media options:

     full-duplex  Forces full-duplex operation

     half-duplex  Forces half-duplex operation.

     Only use mediaopt to set the driver to full-duplex.  If mediaopt is not specified, the
     driver defaults to half-duplex.

     For more information on configuring this device, see ifconfig(8).

HARDWARE

     The igb driver supports Gigabit Ethernet adapters based on the Intel 82575 and 82576
     controller chips:

     ·   Intel Gigabit ET Dual Port Server Adapter (82576)
     ·   Intel Gigabit VT Quad Port Server Adapter (82575)

LOADER TUNABLES

     Tunables can be set at the loader(8) prompt before booting the kernel or stored in
     loader.conf(5).

     hw.igb.rxd
             Number of receive descriptors allocated by the driver.  The default value is 1024.
             The minimum is 80, and the maximum is 4096.

     hw.igb.txd
             Number of transmit descriptors allocated by the driver.  The default value is 1024.
             The minimum is 80, and the maximum is 4096.

     hw.igb.enable_aim
             If set to 1, enable Adaptive Interrupt Moderation.  The default is to enable
             Adaptive Interrupt Moderation.

     hw.igb.num_queues
             Number of queues used for data transfer.  If set to 0, number of queues will be
             configured automatically based on number of CPUs and max supported MSI-X messages on
             the device.

     kern.ipc.nmbclusters
             The maximum number of mbuf clusters allowed.  If the system has more than one igb
             card or jumbo frames are enabled, this value will need to be increased.

     kern.ipc.nmbjumbo9k
             The maximum number of mbuf 9k jumbo clusters allowed.  Increasing this to allow for
             at least 8192 extra clusters per interface can allow for an mtu of 8192.

FILES

     /dev/led/igb*  identification LED device nodes

EXAMPLES

     Make the identification LED of igb0 blink:

           echo f2 > /dev/led/igb0

     Turn the identification LED of igb0 off again:

           echo 0 > /dev/led/igb0

DIAGNOSTICS

     igb%d: Unable to allocate bus resource: memory  A fatal initialization error has occurred.

     igb%d: Unable to allocate bus resource: interrupt  A fatal initialization error has
     occurred.

     igb%d: watchdog timeout -- resetting  The device has stopped responding to the network, or
     there is a problem with the network connection (cable).

SUPPORT

     For general information and support, go to the Intel support website at:
     http://support.intel.com.

     If an issue is identified with the released source code on the supported kernel with a
     supported adapter, email the specific information related to the issue to
     ⟨freebsd@intel.com⟩.

SEE ALSO

     altq(4), arp(4), em(4), led(4), netintro(4), ng_ether(4), polling(4), vlan(4), ifconfig(8)

HISTORY

     The igb device driver first appeared in FreeBSD 7.1.

AUTHORS

     The igb driver was written by Intel Corporation <freebsd@intel.com>.